Rob Nickel is a former police sergeant who worked undercover for the Ontario, Canada, police to catch hundreds of online predators. He now trains police and parents to do the same.

1. It can happen to anyone.

Rob stresses that even straight-A students who never get into trouble can fall victim to a child predator. "They're kids; they trust everybody," Robs says. Teaching your kids street smarts is essential. "I talk to a lot of small communities, and I try to get that across."